bkc2@midway.uchicago.edu (Benjamin Clardy) (05/10/91)
I am looking for SCSI disks (500+ mb) that are capable of high sustained throughput. I am currently running 4.1 on a network of SS1s, IPCs, and SLCs and am switching over to 4.1.1 and sync scsi this weekend. My Fujitsu M2263SA just do not seem to have the throughput. Are Wrens, Wren Runners, M2266SAs, Maxtors, or Micropolis' appreciably faster. I have noticed one interesting aspect with SunOS on this matter. I can be running a job that is taking only about 15% of the CPU, but system response (OpenWindows, keyboard, etc -- I am running this on an IPC w/12MB) is ridiculously slow. I have to nice every job to +19 to get any semblance of keyboard response. In doing process status queries, I typically get back that the job has a status of D -- waiting for the drive to respond with the data. During this time, however, the job has a priority of -24, regardless of what the nice value is. When the job has a status of R -- running the priority jumps back to 0 or respectable positive values. My question is why is the priority set so low on a D status? Is this low priority part of my speed problem? Also, just a pet peeve of mine, Fujitsu and Fuji are two separate entities. They are not part of the same zaibatsu. Fuji is not in the computer business in the U.S. as far as I know. bkc2@midway.uchicago.edu benjamin clardy
kb13+@andrew.cmu.edu (Ken Burner) (06/05/91)
Ben,
Seagate's Elite series is probably the quickest scsi drive on the
market right now, but it's capacity is a whopping 1.6GB. It spins
faster than the standard 3600 rpm, so the rotational latency is only
5.5ms. Also has internal cache, 5MB transfer rate and 11.5msec avg seek.
-Ken Burner
Carnegie-Mellon Computing Services